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5 SP modification:C : 28-33Mangan: min 0.8Spec 5 SP standardC: max 0.3Si: 0.15-0.30Mangan: 0.45-0, 8P: max 0.05S: max 0.05Cr: max 0.5Al: max 0.02Cu: max 0.30 For Thailand: ST 3SP (for the production of SR24 mild steel roundbars) Chemistry: C 0.14 - 0.22%Mn 0.40 - 0.65%Si 0.15 - 0.30%S 0.050% max.P 0.040% max. ST 5SP (for the production of SD30/SD40 deformed bars)C 0.28 - 0.37%Mn 0.50 - 0.80%Si 0.15 - 0.30%S 0.050% max.P 0.040% max. Size : 130 x 130 or 150 x 150 x 12 M. mild steel billets 5sp & 2sp Mild steel billets